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在激烈的市场竞争中,企业只有敏捷抓住商机、快速推出新品,才能增强自身竞争力,赢得尽可能多的市场份额。快速原型制造技术是企业缩短产品面市时间的有效手段之一。本期焦点邀请有关学者、教授就快速原型制造技术的基本概念、快速原型制造技术的应用发展状况、应用快速原型制造技术迅速推出产品的方法等,发表了他们的真知灼见。 相似文献
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TCP与UDP网络流量对比分析研究* 总被引:11,自引:1,他引:11
网络带宽不断增长,越来越多的音/视频、在线游戏等应用成为网络空间的主体。基于实时性考虑,这些新兴应用协议多选择UDP作为其底层的传输协议,使得UDP流量呈上升趋势,而以往的流量测量工作一般基于TCP进行,忽略了UDP协议。对国内某骨干网流量进行了连续12 h的在线测量,在传输层和应用层分别对TCP和UDP及其应用层协议的流的总数、长度分布、持续时间分布、流的速度分布等进行了详尽的分析,并对TCP和UDP的应用层协议流的大小、长短、快慢作了详细的分类。为网络流的分类技术、网络行为发现、网络设计等提供了数据支持。 相似文献
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With the rapid developments of information technology,various industries become much more dependent on networks.Driven by economic interests and the game between countries reflected by growing cyberspace confrontations,evasive network attacks on information infrastructures with high-tech,high concealment and longterm sustainability become severe threats to national security.In this paper,we propose a novel two-phased method for the detection of evasive network attacks which exploit or pretend to be common legal encryption services in order to escape security inspection.Malicious communications which camouflage themselves as legal encryption application are identified in the SSL'session structure verification phase firstly,and then by serverside X.509 certificate based anomaly detection,suspicious attack behaviors are further distinguished effectively.Experiment results show that our method is very useful for detecting the network activities of certain unknown threats or new malwares.Besides,the proposed method can be applied to other similar services easily. 相似文献